Whether you choose to include MCT oil/powder depends on the type of fasting and your goals.
If you’re interested in a stricter fast with more specific goals, you might decide against using any supplementation.
MCT oil yields benefits, such as improving insulin sensitivity, curbing hunger cravings, and increasing ketone production. More ketones mean more energy, and feeling more energetic and focused could make fasting a little easier for you, consequently helping you reach your objectives.
You could try MCT oil for the first few days of an extended fast to give yourself an energy boost and stop the MCT oil on the fourth day. MCTs could give you the boost and fuel you need to last through an extended fast (fasting for multiple days at a time). MCT oil is often incorporated with fat fasting.
One or two MCT tablespoons daily is a reasonable amount. Remember, a little goes a long way. You might find you prefer to split your MCT into smaller portions, such as teaspoons, throughout the day.
If you’re only doing shorter fasts and time-restricted eating, you could add MCT oil a few hours before your first meal of the day.
You might need to experiment to see what works best for you and discover your sweet spot with the right type of fasting, duration, and supplementation.
I use it in my coffee every morning while fasting and I am still loosing weight nicely